- Fixed the polling/display system:

One ID-keyed message ledger now handles sends and polls.
Messages are always sorted by server ID, latest at bottom.
Duplicate DOM rows and voice players are removed.
Poll cursors advance only from validated received messages.
Voice autoplay queues each received clip once.
Added exact user_id ownership tracking.
Cache-busted client to 20260609.4.

index.html

@@ -17,7 +17,7 @@
   <script>
     window.CYBERCHAT_BASE = '';
   </script>
-  <script src="assets/js/cyberchat-app.js?v=20260609.3"></script>
+  <script src="assets/js/cyberchat-app.js?v=20260609.4"></script>
   <script>
     document.addEventListener('DOMContentLoaded', function() {
       CyberChat.init('#app');